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  <title>Returns an object for BSON serialization</title>
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  <div id="layout-content"><div id="mongodb-driver-readconcern.bsonserialize" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">MongoDB\Driver\ReadConcern::bsonSerialize</h1>
  <p class="verinfo">(mongodb &gt;=1.2.0)</p><p class="refpurpose"><span class="refname">MongoDB\Driver\ReadConcern::bsonSerialize</span> &mdash; <span class="dc-title">Returns an object for BSON serialization</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-mongodb-driver-readconcern.bsonserialize-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">final</span> <span class="modifier">public</span> <span class="methodname"><strong>MongoDB\Driver\ReadConcern::bsonSerialize</strong></span>(): <span class="type">object</span></div>

 </div>


 <div class="refsect1 parameters" id="refsect1-mongodb-driver-readconcern.bsonserialize-parameters">
  <h3 class="title">参数</h3>
  <p class="para">此函数没有参数。</p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-mongodb-driver-readconcern.bsonserialize-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Returns an object for serializing the ReadConcern as BSON.
  </p>
 </div>


 <div class="refsect1 errors" id="refsect1-mongodb-driver-readconcern.bsonserialize-errors">
  <h3 class="title">错误／异常</h3>
  <ul class="simplelist">
   <li class="member">Throws <span class="classname"><a href="class.mongodb-driver-exception-invalidargumentexception.html" class="classname">MongoDB\Driver\Exception\InvalidArgumentException</a></span> on argument parsing errors.</li>
  </ul>
 </div>



 <div class="refsect1 examples" id="refsect1-mongodb-driver-readconcern.bsonserialize-examples">
  <h3 class="title">范例</h3>
  <div class="example" id="example-1332">
   <p><strong>示例 #1 <span class="function"><strong>MongoDB\Driver\ReadConcern::bsonSerialize()</strong></span> with empty read concern</strong></p>
   <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br />$rc&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">MongoDB</span><span style="color: #007700">\</span><span style="color: #0000BB">Driver</span><span style="color: #007700">\</span><span style="color: #0000BB">ReadConcern</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$rc</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">bsonSerialize</span><span style="color: #007700">());<br /><br />echo&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">MongoDB</span><span style="color: #007700">\</span><span style="color: #0000BB">BSON</span><span style="color: #007700">\</span><span style="color: #0000BB">toJSON</span><span style="color: #007700">(</span><span style="color: #0000BB">MongoDB</span><span style="color: #007700">\</span><span style="color: #0000BB">BSON</span><span style="color: #007700">\</span><span style="color: #0000BB">fromPHP</span><span style="color: #007700">(</span><span style="color: #0000BB">$rc</span><span style="color: #007700">));<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
   </div>

   <div class="example-contents"><p>以上例程的输出类似于：</p></div>
   <div class="example-contents screen">
<div class="cdata"><pre>
object(stdClass)#2 (0) {
}

{ }
</pre></div>
   </div>
  </div><div class="example" id="example-1333">
   <p><strong>示例 #2 <span class="function"><strong>MongoDB\Driver\ReadConcern::bsonSerialize()</strong></span> with local read concern</strong></p>
   <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br />$rc&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">MongoDB</span><span style="color: #007700">\</span><span style="color: #0000BB">Driver</span><span style="color: #007700">\</span><span style="color: #0000BB">ReadConcern</span><span style="color: #007700">(</span><span style="color: #0000BB">MongoDB</span><span style="color: #007700">\</span><span style="color: #0000BB">Driver</span><span style="color: #007700">\</span><span style="color: #0000BB">ReadConcern</span><span style="color: #007700">::</span><span style="color: #0000BB">LOCAL</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$rc</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">bsonSerialize</span><span style="color: #007700">());<br /><br />echo&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">MongoDB</span><span style="color: #007700">\</span><span style="color: #0000BB">BSON</span><span style="color: #007700">\</span><span style="color: #0000BB">toJSON</span><span style="color: #007700">(</span><span style="color: #0000BB">MongoDB</span><span style="color: #007700">\</span><span style="color: #0000BB">BSON</span><span style="color: #007700">\</span><span style="color: #0000BB">fromPHP</span><span style="color: #007700">(</span><span style="color: #0000BB">$rc</span><span style="color: #007700">));<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
   </div>

   <div class="example-contents"><p>以上例程的输出类似于：</p></div>
   <div class="example-contents screen">
<div class="cdata"><pre>
object(stdClass)#2 (1) {
  [&quot;level&quot;]=&gt;
  string(5) &quot;local&quot;
}

{ &quot;level&quot; : &quot;local&quot; }
</pre></div>
   </div>
  </div>
 </div>



 <div class="refsect1 seealso" id="refsect1-mongodb-driver-readconcern.bsonserialize-seealso">
  <h3 class="title">参见</h3>
  <ul class="simplelist">
   <li class="member"><span class="methodname"><a href="mongodb-bson-serializable.bsonserialize.html" class="methodname" rel="rdfs-seeAlso">MongoDB\BSON\Serializable::bsonSerialize()</a> - Provides an array or document to serialize as BSON</span></li>
   <li class="member"><a href="https://www.mongodb.com/docs/manual/reference/read-concern/" class="link external">&raquo;&nbsp;Read Concern reference</a></li>
  </ul>
 </div>


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